JPH0547020A - Optical disk device for information recording and reproducing - Google Patents

Abstract

PURPOSE:To prevent the generation of a damage, etc., caused by the contact with an optical recording medium in an optical disk device for the information recording and reproducing using a floating slider. CONSTITUTION:A movable body 2 mounting the head floating part 4 of the optical disk device for the information recording and reproducing is driven by a driving section 5 and the recording area of a recording medium 1 is moved and scanned. An engaging rod 4f is fixed to the air slider 4a of a head floating part 4 and engageably positioned at a driving rod 6c by a piezoelectric actuator 6a. When a voltage is impressed to the piezoelectric actuator 6a immediately before/after the start of a float travelling, the air slider 4a is driven in a direction away from the optical recording medium 1 and the contact is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device for recording / reproducing information by optical and magneto-optical effects, and more particularly to an information recording / reproducing optical disk device provided with a flying slider.

[0002]

2. Description of the Related Art FIGS. 9 to 11 are for explaining an example of a conventional information recording / reproducing optical disk device.
9 is a perspective view of a main part, FIG. 10 is a sectional view taken along the line AA of FIG. 9, and FIG. 11 is an explanatory view of a driving coil. 1 in the figure
Is an optical recording medium, 2 is a movable body, 2a is a carriage, 2b is a driving coil, 2c is an opening, 2d is a reflecting prism, and 3d.
Is an elastic member, 4 is a head floating part, 4a is an air slider, 4b is a slider surface, 4c is a central clearance part, 4d is an optical path opening, 4e is an objective lens, 5 is a drive part, 5a is a linear bearing, 5b is Magnetic yoke, 5c magnet, 5d holding material,
5e is a base.

As shown in FIGS. 9 and 10, the main parts of the information recording / reproducing optical disk device are roughly classified into a movable body 2,
It is composed of an elastic member 3, a head floating unit 4, and a drive unit 5,
Information is recorded on and reproduced from the optical recording medium 1. Movable body 2
Supports the head floating portion 4 by the elastic member 3 and is driven by the driving portion 5 to move and scan the recording area of the recording medium 1.

The movable body 2 is arranged near the rotating optical recording medium 1 and has a drive coil 2b. The drive unit 5 is composed of a pair of magnetic yokes 5b inserted through the insertion portion of the movable body 2 and magnets 5c arranged in the vicinity of the magnetic yokes 5b along the length direction thereof. The section 4 is mounted on the movable body 2 via the elastic member 3, and is floated by the air flow accompanying the rotation of the optical recording medium 1 and converges the converged light from a light source (not shown) on the converging surface of the optical recording medium 1. It is equipped with an optical head. Movable body 2
Is moved in the radial direction of the optical recording medium 1 by the electromagnetic force accompanying the energization of the driving coil 2b, and recording and reproduction are performed. As the optical recording medium 1, a magneto-optical recording disk or the like is used.

The drive coil 2b of the movable body 2 is formed in a tubular shape and has a coil main body having an opening on a side surface facing the optical recording medium, and an inner wall of the coil main body provided at an opening forming portion in the coil main body. And a coil around which the coil body and the reinforcing coil wall, which are formed of a pair of reinforcing walls that form the insertion portion of the magnetic yoke between the coil body and the coil, are bonded to each other and integrally formed into a bobbinless drive coil. Is configured as. The drive coil 2b is provided so as to be movable along the magnetic yoke 5b by the linear bearing 5a, and the portions on both sides as viewed from the moving direction are formed in an elliptic cylinder shape. FIG. 11A shows the cross section,
This state will be apparent from the shape of the end portion of the driving coil 2b shown in FIG. In the central portion of the drive coil 2b, the elastic member 3 and the head floating portion 4 are located in FIG. The shape of the coil in this portion is shown in FIG.
As shown in, a rectangular opening 2c is formed at the center of the driving coil 2b. The optical head is attached to the opening 2c via the elastic member 3.

In the information recording / reproducing optical disk device having such a structure, the movable body 2 moves in the radial direction of the optical recording medium 1 due to the electromagnetic force accompanying the energization of the driving coil 2b. The head floating unit 4 is also moved and scanned, and track control is performed to record and reproduce information. Focus control is performed using a focus adjustment relay lens (not shown) in consideration of the flying amount of the head floating unit 4.

In the head floating portion configured as such a conventional flying slider, the flying slider runs while contacting the optical recording medium immediately before and after the start of flying. Therefore, there is a problem that scratches and the like are likely to occur on the recording medium surface and the running surface, and there is a concern that the reproduction signal may deteriorate and the durability may deteriorate.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and information recording is made so as not to come into contact with an optical recording medium immediately before and after the start of flying of a flying slider. The object is to realize a reproducing optical disk device.

[0009]

The present invention provides an information recording / reproducing optical disc apparatus having a flying slider that is levitated by an air flow accompanying the rotation of a recording medium, in which the flying slider section and the recording medium are relative to the recording medium surface. It is characterized in that it is provided with a mechanism capable of relative movement so as to be separated in the vertical direction.

It is possible to use a mechanism which makes it possible to move the flying slider section vertically to the recording medium surface. By moving the flying slider portion in the radial direction of the recording medium, it is possible to use a mechanism that allows the flying slider to move vertically with respect to the recording medium. A piezoelectric actuator can be used as a drive source for moving the flying slider vertically to the recording medium surface. A mechanism that moves the recording medium perpendicularly to the flying surface of the flying slider can be used. A mechanism may be used in which the recording medium moves in the direction approaching the slider traveling surface after the spindle motor starts rotating, and the recording medium moves in the direction moving away from the slider traveling surface immediately before the spindle motor stops rotating. It is possible to use a mechanism including the drive unit for driving the flying slider unit so that the flying slider unit can be moved vertically to the recording medium surface.

[0011]

According to the present invention, since the flying slider and the recording medium are vertically movable relative to each other, the flying slider and the recording medium are separated by a certain distance when the recording medium starts and stops rotating. By setting like this, it is possible to prevent the occurrence of scratches and the like due to the contact between the flying slider and the recording medium,
It is possible to obtain an optical disk device for information recording / reproduction that has improved durability, no deterioration of reproduction signals, and long life and high reliability.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 and 2 are for explaining a first embodiment of an information recording / reproducing optical disk apparatus of the present invention. FIG. 1 is a perspective view of a main part, and FIG. 1 is a sectional view taken along line AA of FIG. In the figure, the same parts as those in FIGS. 9 and 10 are designated by the same reference numerals. Reference numeral 4f is an engagement rod, 6a is a piezoelectric actuator, 6b is a fulcrum, and 6c is a drive rod. The outline thereof is similar to that described with reference to FIGS. 9 to 11, but will be described in more detail with reference to the drawings.

As described above, the movable body 2 has the air slider 4a arranged near the optical recording medium 1 and the objective lens 4e mounted on the air slider 4a.
The movable portion 2 is supported by an elastic member 3 made of phosphor bronze or the like that supports these so as to follow the surface wobbling of the optical recording medium 1. The movable unit 2 is a movable body 2 which is an optical recording medium 1.
Coil 2b for moving and operating in the track direction
Equipped with a reflection prism 2d for irradiating the objective lens with laser light from a laser diode (not shown), and guided by a carriage 2a to a linear bearing 5a formed of stainless steel, aluminum or the like for high accuracy. Keep and move.

The air slider 4a is made of a ceramic material or a soft magnetic material such as ferrite. An optical path opening 4d is provided at the center of the air slider 4a. The air slider 4a is made of plastic or the like and focuses laser light on the optical recording medium 1. The objective lens 4e for doing so is attached to the optical path opening 4d.
Further, on the surface facing the optical recording medium 1, there is formed a slider surface 4b for flying and moving the movable body 2 by the air flow accompanying the rotation of the optical recording medium 1. The middle portion thereof functions as a central clearance portion 4c that stabilizes the floating traveling of the head floating portion 4. To smooth the inflow and outflow of air at the air inflow end and air outflow end of the slider surface,
A tapered portion is formed. In this embodiment, alumina ceramics was used as the material of the air slider 4a, but the material is not limited to this.

An example of the drive coil 2b for moving the head floating portion 4 in the track direction of the optical disk at high speed and with high precision has been described with reference to FIG. 11, but the coils are joined by an adhesive such as epoxy resin. The bobbin-less structure is used to increase the rigidity and weight of the coil itself. In addition, a prism 47 that reflects the laser light in the direction of 90 degrees and irradiates the objective lens 4 is arranged at the center of the driving coil 2b.

The magnet 5c which gives a magnetic field to the driving coil is
A rare earth iron-based permanent magnet was used, but the present invention is not limited to this.

In this embodiment, the engagement rod 4f is fixed to the air slider 4a. Further, the lower end of the piezoelectric actuator 6a is fixed to the base 5e side, and one end of the drive rod 6c is engaged with the tip of the piezoelectric actuator 6a. The drive rod 6c is supported by a fulcrum 6b fixed to the holding member 5d, and the other end side is positioned so as to be engageable with the engagement rod 4f. When a DC voltage is applied to the piezoelectric actuator 6a, the tip end of the piezoelectric actuator 6a is displaced, the other end of the drive rod 6c is engaged with the engagement rod 4f, and the air slider 4a is driven downward in the figure. As a result, the air slider 4a is driven in a direction away from the optical recording medium 1. By positioning the fulcrum 6b near the piezoelectric actuator 6a, the air slider 4a can be displaced with a larger displacement than that of the piezoelectric actuator 6a.
Can be displaced.

FIG. 3 shows how the air slider 4a moves up and down. At rest, the air slider 4a is placed at a position where the engagement rod 4f opposes the drive rod 6c. Figure 3
As shown in (A), when the optical recording medium 1 is inserted, the piezoelectric actuator 6a is energized to drive the drive rod 6c.
Engages with the engaging rod 4f to separate the air slider 4a from the optical recording medium 1 by a sufficient distance, for example, 100 μm or more. Steady rotation of the disk (1800 rpm-3600
(rpm), the power supply to the piezoelectric actuator 6a is stopped. As a result, as shown in FIG. 3B, a constant load (for example, 10 to 15 g) is applied to the elastic member that supports the air slider 4a, and the air slider 4a moves over the surface of the rotating optical recording medium 1. You will be levitating. Further, when the rotation is stopped, the piezoelectric actuator 4a is energized, and as shown in FIG.
It is possible to avoid the distance a from the optical recording medium 1 to a sufficient distance. As a result, the optical recording medium 1 and the air slider 4a are
The flying head can be prevented from traveling in contact with the flying head, so that it is possible to prevent abrasion of the slider surface and adhesion of abrasion powder on the optical recording medium, and a flying head with good reliability and durability. It is possible to obtain an optical disk device for use.

FIGS. 4 and 5 are for explaining the second embodiment of the present invention, FIG. 4 is a perspective view of an essential portion, and FIG. 5 is an operation explanatory view. The configurations of the movable body, the elastic member, the head floating portion, the driving portion, and the like may be the same as those described with reference to FIGS. In this example, a wedge-shaped member is used,
The air slider was moved vertically. In the figure, 1 is an optical recording medium, 4a is an air slider, 4g, 6
d is a wedge-shaped member and 5d is a holding member. The air slider 4a and the holding member 5d may be considered to be the same as those described with reference to FIGS. The wedge-shaped member 4g is fixed to the air slider 4a, and the wedge-shaped member 6d is fixed to a position outside the data area of the holding member.

In this embodiment, the movable body moves out of the data area during rest. As shown in FIG. 5, the solid line indicates one of the positions of the air slider 4a during recording or reproduction. In this state, the air slider 4a is in a floating state due to the air flow. When the optical recording medium 1 is not mounted or is inserted, the air slider 4a is
The optical recording medium 1 is moved to the outside of the data area on the outer peripheral portion. At this position, the wedge-shaped member 6d provided on the holding member 5d is
By pushing down the wedge-shaped member 4g of the air slider 4a, the air slider 4a is kept at a predetermined distance from the surface of the optical recording medium 1, for example, 100 μm.

After inserting the optical recording medium 1, a steady rotation (180
After reaching 0 rpm to 5400 rpm), the air slider 4a is moved to the data area of the optical recording medium 1. Due to the movement, the wedge-shaped member 4g is separated from the wedge-shaped member 6d and floats on the surface of the optical recording medium 1. Therefore, the optical recording medium 1 and the air slider 4a can be levitated without traveling in contact with each other, so that it is possible to prevent the slider surface from being scraped or the abrasion powder to be attached to the disk, and the reliability is good.
A durable flying head optical disk device can be obtained.

Although the head floating portion is moved vertically in these embodiments, the entire driving portion may be moved, for example, by the base 5e.

6 to 8 are for explaining a third embodiment of the present invention. FIG. 6 is a schematic configuration diagram, FIG. 7 is a sectional view taken along line BB of FIG. 6, and FIG. 8 is an operation. FIG. The configurations of the movable body, the elastic member, the head floating portion, the driving portion, and the like may be the same as those described with reference to FIGS. In this embodiment, the optical recording medium is moved in the vertical direction. In the figure, the same parts as those in FIG. 1 and FIG. Reference numeral 7a is a spindle motor, 7b is a mounting substrate, and 7c is a piezoelectric actuator.

In this embodiment, a mounting substrate 7b of a spindle motor 7a that supports and drives the optical recording medium 1 is mounted on a base (not shown) by a piezoelectric actuator 7c. When a DC voltage is applied to the piezoelectric actuator 7c, the mounting substrate 7b is displaced upward due to the electrostriction phenomenon, and the air slider 4a and the optical recording medium 1 are kept at a distance. When no DC voltage is applied, the air slider 4a is placed at the recording / reproducing position.

When the optical recording medium 1 is inserted, the piezoelectric actuator 7c is urged to move the air slider 4a from the optical recording medium 1 at a sufficient distance, for example, as shown in FIG.
Separate by 100 μm or more. Steady rotation of disk (18
00 rpm to 3600 rpm), the energization of the piezoelectric actuator 7c is stopped, and the optical recording medium 1 is moved perpendicularly to the running surface of the air slider 4a as shown in FIG. The optical recording medium 1 is brought close to the running surface of the air slider 4a up to a distance where a constant load (for example, 10 to 15 g) is applied to the elastic member supporting 4a. At the same time when the rotation of the optical recording medium is stopped, the piezoelectric actuator 4a is energized to move the optical recording medium 1 from the running surface of the air slider 4a by a sufficient distance, for example, 10
Move to 0 μm. As a result, the optical recording medium 1 and the air slider 4a can be levitated without traveling in contact with each other, so that it is possible to prevent abrasion of the slider surface and adhesion of abrasion powder to the disk, resulting in good reliability. Thus, it is possible to obtain a durable optical disk device for a floating optical head.

As means for obtaining a driving force for moving the air slider or the optical recording medium in the vertical direction,
Although the piezoelectric actuator is used, it is not limited to this. It is also possible to use a magnetostrictive element or an electromagnetic force, or it is possible to use a suitable displacement means such as a cam mechanism capable of displacing the air slider and / or the optical recording medium.

In the embodiment using the piezoelectric actuator, the voltage is not applied to the piezoelectric actuator at the time of recording / reproducing, but the voltage is applied at the time of recording / reproducing depending on the electrostrictive element or the driving structure used. Good.

[0028]

As is apparent from the above description, according to the present invention, since the optical recording medium and the flying slider portion fly without making contact, the flying slider is not damaged. It is possible to perform the traveling start and end operations. Further, there is an effect that it is possible to prevent the sticking phenomenon between the slider and the disk when the disk rotation is stopped. Therefore, the reliability and durability of the floating optical disk device can be significantly improved.

[Brief description of drawings]

FIG. 1 is a perspective view of a main part of a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram of an operation of the first embodiment.

FIG. 4 is a perspective view of a main part of a second embodiment of the present invention.

FIG. 5 is an explanatory diagram of an operation of the second embodiment.

FIG. 6 is a schematic configuration diagram of a third embodiment of the present invention.

7 is a sectional view taken along line BB of FIG.

FIG. 8 is an explanatory diagram of the operation of the third embodiment.

FIG. 9 is a perspective view of a main part of an example of a conventional information recording / reproducing optical disk device.

10 is a cross-sectional view taken along the line AA of FIG.

FIG. 11 is an explanatory diagram of a drive coil.

[Explanation of symbols]

1 optical recording medium, 2 movable body, 2a carriage, 2b
Drive coil, 2c opening, 2d reflective prism, 3
Elastic member, 4 head floating portion, 4a air slider, 4b slider surface, 4c central clearance portion, 4d optical path opening portion, 4e objective lens, 4f engaging rod, 5 driving portion, 5a linear bearing, 5b magnetic yoke, 5c Magnet, 5
d holding material, 5e base, 6a piezoelectric actuator,
6b fulcrum, 6c drive rod.

Claims (1)

[Claims] 1. An information recording / reproducing optical disc device having a flying slider that is levitated by an air flow caused by the rotation of a recording medium, wherein a flying slider section and a recording medium are separated from each other in a direction perpendicular to a surface of the recording medium. An optical disk device for information recording / reproducing, which is provided with a mechanism that makes it physically movable.